No. That's no acceptable. You've issued yourself a challenge, sir, and even if you're image doesn't turn out great, you should do an image. Even if its a few minutes off effort. Even if its less. You gave yourself an image a day challenge - don't let yourself down!
(This is supposed to be encouraging, not demanding. If it comes off that way.)
All the successful artists I know claim to have gotten that way through bloody-minded persistance, and doing /something/ every day, no matter what. Some of them aren't even terribly good!
Edit: Okay, most. I don't know how the one fucker managed it, and he's not sharing.